Portable test instrument



FIG. 1 is a perspective view of a portable test instrument showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions shown in broken lines depict environmental structure only and do not form part of the claimed design. 

CLAIM The ornamental design for portable test instrument, as shown and described. 